Remove Blue Sky Color Cast - viewed
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Introduction

In this Photoshop tutorial we're going to remove most of the blue sky color cast that is visible on a man's white shirt, but what also could have been visible on something like a white wedding dress.
I'll show you a Photoshop technique that is flexible and easy to adjust using a Mask and a Hue & Saturation adjustment layer.

1. Preparations

Start
by making a copy of the background layer in Photoshop, by left clicking
on it with the mouse button and dragging it to the New
Layer icon ; Photoshop
creates a copy of the background layer and makes this
new layer active.

2. Select the area that has the blue cast

Select the Lasso
Tool in
the tool bar and make a global selection of the man.

3. Adding a Mask

With
the layer still active, add a mask. Click on the Add
Layer
Mask icon (1) and a new mask (2) will appear.
Also notice that a new icon ()
appears in front of the layer (3) that reminds
us that we have a layer mask and that the layer mask is active.
A layer mask also has a double border if it's active and single one if
it's not active.

Make sure that the mask is active. Now
go to Filter/Blur/Gaussian Blur... and slightly
blur our mask with a small Radius like 4.

4. Adding a Hue & Saturation adjustment layer

Now
hold down the Alt key
(option key on the Mac) and click on the New
Adjustment Layer icon (4).
Don't release the Alt key yet! Select Hue/Saturation... in
the little window that pops up.

5. Remove the cast

We're
now going to change the saturation of
the blue cast, by selecting Cyans in
the Edit box
(5). We now have to select
the color cast in
the white shirt. Use the Eye
Dropper + tool (8)
to select as many variations of the blue cast on the
white shirt.
Now we slide the saturation slider until
we have removed most of the cast. In my example I've used a value of
-55 (7). You can remove all blue, but to me the result looks unnatural,
so I always leave some blue behind.

Click Ok and we're done.

And
here is the final result:

Final words

This technique
has several advantages, since the adjustments
(masks,
hue & saturation
layer) are non-destructive, the original stays intact.
It's easy to fine tune the mask or hue & saturation,
making it a perfect technique for several other corrections.
Always make sure that you use selections when you make corrections like
these.
There is still some blue cast on the concrete on the right side of the
image and on the shirt of the man in the background. These are areas
that you might want to include in your mask.